Leak tests of pipe installations for municipal gas, grid gas and natural gas according to the pressure measurement method with air B 3.

Leak tests according to the visual inspection method with air A 3.

Pressure tests of pipes according to DVGW-TRGI (DVGW sheet G 600).

The TRGI regulations of 2008 distinguish between two categories of tests for pipe systems:

a) Pipes with operating pressures up to 100 mbar.
b) Pipes with operating pressures of 100 mbar to 1 bar.

Tests according to a) comprise:

1. The preliminary test is a load test of newly installed pipes without fittings or with fittings, if the nominal pressure rating of such fittings is at least as high as the test pressure. Pipe openings must be closed with metallic components. Connection to gas carrying pipes is not permitted. Test pressure: 1 bar – 10 min.

The leak test instruments DPK 60 and DPK 60-2 are designed for such tasks.

2. The main test is a leak test of all pipes including fittings, but without any gas devices, associated controllers or any safety equipment. Test pressure: 150 mbar – 10, 20, 30 min. The leak test set DPK 60-2 with electronic pressure meter is particularly suitable for these tests as it is capable of detecting small pressure drops of 0.1 mbar within a measuring range of up to 199.9 mbar.

Tests according to b) comprise:

A combined load and leak test of the pipes including fittings, the normal pressure ratings of which are at least as high as the test pressure. Test excludes pressure controllers, gas meters, gas instruments and associated control and safety equipment. Pipe openings must be closed off with metallic components. Connection of gas carrying pipes is not permitted. Test pressure: 3 bar at a maximum pressure increase of 2 bar/min.

The DPK 60-2 with pressure meter S2510 and recorder is particularly suitable for such tests.

Additionally, the leak test instruments can be used for the following tasks:

1. Main test or combined load and leak test of pipes (before gas is admitted), which are out of service or shut down and pressure tests, which are used to prove that openings of pipes are correctly sealed (generated pressure is maintained for a short period of time).

2. Leak tests according to the visual inspection method with air: A 3 with foaming agents according to EN 14291:

Connections and transition points

Shut-off devices

Pressure controllers

Gas meters, other gas devices

Connection pipes for instruments and fittings

Seals and test ports. These tests must be carried out at the pressures shown on the type designation labels (nominal pressure ratings) of the respective units. The test pressure should not exceed these nominal pressure ratings.

3. Pressure tests of gas supply pipes and installations on the basis of the visual inspection method with air A 3 and the pressure measurement method with air B 3 according to DVGW sheet G 469 all in accordance with the regulations stipulated by DVGW sheets G 459, 461/I, 462/ I and 472.